The incorporation of a right to (the protection of) a healthy environment in the Constitution or an obligation for the government to protect the environment or to make careful use of the country's natural resources has become a very popular notion over the last few decades. The constitutions of over a hundred countries presently contain such a provision in some form or other. In this book the author investigates the pratical legal consequences of such a right and analyses the added value of the Aarhus Convention.